Gin-saw sharpening and gumming device



1. J. SMITH.

GIN SAW SHARPENING AND GUMNIING DEVICE'. APPLICATION FILED AUG-IZ. 1918.

1,304,614, PaterntedIMay 27,-l9l$r}.

II SHEETS-SHEET I.

1.1. SMITH. GIN SAW SHARPENING AND GUMMING DEI/ICE. APPLICATION FILED AUG.I2. I9IB.

1,304,614. Patented May 27, 1919.

3 SHEETS-SHEET 2.

= lIn "mumllHIIIll I' A NORA/EVS J. 1. SMITH. GIN SAW SHARPENING AND GUMIVIING DEVICE.

APPLICATION FILED AUGJZ. i918. y 1,304,614, Patented May 27, 1919.

3 SHEETS-SHEET 3.

W/ TNESSES 9% "@W- JOHN JAoKsON sMIrH, or McDONOUeH, GEORGIA.

GI-SAW SHARPENING ND AGrllTlYflViIlfNGr DEVICE.

Specification of Letters Patent. Patented May 27, 1919.` i

Application inea August 12, 191s. serial No. 249,479.

To all whom t may concern VBe it known that I, JoHnT JACKSON. SMITH, a citizen of the United States, and a resident of McDonough, in the county of Henry and State of Georgia, have invented certain new and useful Improvements in Gin-Saw Sharpening and Gumming Devices, of which the following is a specifica-tion.

My invention is an improvement in gin saw sharpening and vgummingV devices, and has for its object to provide mechanism of the character specified for grinding gin saws, wherein a grinding wheel is provided for grinding the throats Of thesaws, and reciprocating files for finishing the edges of the throats, and wherein other mechanism is provided for advancing the teeth of Vthe saws, the advancing mechanism operating in alternation with the grinding mechanism.

In the drawings:

Figure 1 is a top plan view of the improved gin saw sharpening and gumming device;

Fig. 2 is a side view;

Fig. 8 is an enlarged sectional detail;

Figs. 4 and G are sections on the lines -l-4 and 6 6, respectively, of Fig. 1;

Fig. 5 is a section on the line 5-5 of Fig. 2.

Fig. 7 Fig;

Fig. 8 is aplan view of the pawl plate.

The present embodiment of the invention is shown in connection with a series of gin saws 1 arranged upon the mandrel 2 in the usuall manner, and the improvement comprises a staff or standard 8 having a suitable base 4. which may rest uponthefloor of the gin house, the base being so' arranged that the staff or standard will be held in inclined position, inclining toward the saws.

A frame 5 is mounted on the staff or standard, and is adjustable vertically thereof, the frame having at one end a bearing sleeve 6 whichis slidable on the standard and which is held in adjusted position by means of a set screw or the like. At the opposite end from the standard the side members converge, las shown, and they are connected to 'opposite sides of. the body of a yoke 7 the armsof `the yoke being adapted to engage over the spacing collars 9 between the sides. Thus the framenis supportedbetween the mandrelandthe standard.

: A clamping member,l consisting of an upper section 10 anda lower section 11, is conis a section on the line 7-7 of nected with the body of the yoke at one side thereof, the upper section 10 being riveted to the body of the yoke while the lower section 11 is adjustably connected with the upper section, by means of laterally extending straps 12 and 12a which are riveted to the upper section, the former being riveted to the lower section and the latter to the upper section, and each strap has a slot through which passes a set screw, to adjustably connect the sections together. The sections 10 and 11 are bent outwardly from each other, as shown, to engage above and below ya spacing collar 9. The stop member -7 yengages on one' face of the saw being sharpened while the clamping member engages on the other face, and it will be evident that by loosening the said screws the lower section 11 of the clamping member `may drop down to permit easy disengagement of the Vframe from the mandrel.

A gumming wheel 13 is provided for gumming the throat between the teeth, and the said wheel is secured to one end of a shaft 15. This shaft, as shown more particularly in Fig. 4, is sectional, consisting of a section l5 to which the Vwheel is secured and a section 15a which has secured at the end remote from the gumming wheel a bevel gear 16 meshing with journaled in brackets 19 on the frame 5. The sections 15 and 15a at their adjacent ends are received in a tubular casing or sleeve 20, the sections engaging opposite ends of the casing, and the section 15a is securedto the casing by means Of a cap 21 which engages over the end of the casing and is secured to both shaft and casing by means of a set screw 22. The section 15@L has a transverse pin 23 which engages oppositely a gear 17 on a drive shaft 18 arranged longitudinally extending slots 24 in the casing, and it will be evident that by loosening the set screw the section 15a may :be vadjusted longitudinally of the tubular one-of the slots 24. This spring normally acts to draw the casing 2O toward the shaft 18. The shaft 18 is provided at each end with a disk or fly wheelv 29 and each of these disks or-fly wheels has a wrist pin eccentric to the shaft 18. The wrist pins are for operating longitudinally moving files to be presently described, and the shaft has also a gear wheel 30 which meshes with a wheel 31 on a driving shaft 32 journaled in bearing standards 33 on the' frame, the said shaft having at one end a crank 34 for convenience in rotating the same.

Each of the tiles 35 is held in a socket in one end of a rod 36, and each rod is mounted to move in bearing sleeves 37 supported by the frame. The files are held in the sockets by means of set screws as shown, and each rod 36 has a laterally extending pin 37a intermediate its ends, which engages a bearing sleeve on one end of a link 38. The other end of each link 38 is pivoted to a clip 39 on the wrist pin of the adjacent disk 29. It will be obvious that when the shaft 19 is rotated the links 38 will reciprocate the rods 36, and since these rods converge toward the saws, in such manner that the liles 35 cross at the' periphery of the saws, that is, just inside the points of the teeth, the opposite faces of the saw will be cut by the files at the throats of the teeth to smooth the same after the grinding bythe wheel 13,

Mechanism is provided for advancing the saw being operated upon the dist-ance 0f one tooth, and this mechanism also controls the,I lifting and lowering of the grinding wheel to bring it Vinto and out of operative position. The end of the shaft section 15a adj-a.- cent to the shaft 19 is supported by a bear-A ing bracket 4() which is journaled on the shaft l5 to swing'with respect thereto. An elbow lever, consisting of an arm 41 and an arm 42, is pivotally connected to the frame near the connection with the body of the as indicated at 43, and the arm. 41 which normally extends vertically has an opening through which is passed one end of a rod This rod is held in adjusted position with respect to the arm 41 by means of a set screw 45, and the other end of the rod has a foot to which is connected pawl mechanism for engaging the -teeth of the saw to move the same. This foot 45, as shown in F ig. 6, extends at an angle of approximately fortyiive degrees with respect to thebody ofthe rod, and a forked reinforcing plate 46 is secured to the foot by means of screws 47. The arms of the forked plate 46 engage on opposite sides of the saw, and these arms are of such length that their free ends are never beyond the periphery of the saw.

The pawl plate 48 is of relatively thin material and is arranged between the foot and the forked plate, and the openings 48a for receiving the screws 47 in the said pawl plate are slots extending transversely of the plate so that when that portion of the pawl plate engaging theftee-th of the saw becomes worn the plate may 'be shifted laterally to bring a new surface into engaging position.

The rod 44 is normally drawn downward toward the teeth of the saw by means of a coil spring 49 arranged between the rod and the body of the yoke 7, and it is moved upln the opposite direction the roller will roll down the inclined plate, permitting the pawl to engage the teeth of the saw. The connection between the arm 41 of the elbow lever and rod 44 is a swinging connection. A bearing block 52 is kpivotally connected to the upper end of the arm, as indicated at 53, and the rod passes through this bearing. The set screw 45 is threaded through the bearing into engagement with the rod, and

Vthe bearing rocks freely with respect to the arm -on a transverse axis 56.

The section 15 of the shaft 15-15a passes through a. bearing sleeve 54 which is mount ed to slide vertically in a slot in a bracket arm 55 extending upwardly from the yoke body 7. This bearing sleeve has a portion 54a which extends through the slot, and a rod 57 which is pivoted at its lower end to the arm 42 of the elbow lever 41-42 passes through this portion 54a, being slidably connec-ted therewith.

A coil spring 58 encircles the rod between a wing nut 59fthreaded on to the top of the rod and the portion 54a of the sliding bearing. A stop collar60 is adjustably held on the rod below this portion 54a by means of a set screw as shown, and it will be obvious that when the lever 41-42 is rocked the rod 57 may move downwardly with respect to the bearing 54 `within limits prescribed by the tension of the spring 58, and the tension may be regulated `yby the wing nut 59. An eccentric rod 61 connects the arm 41 of the elbow lever with a cam 62 von the shaftv 32 before mentioned. This eccentric rod 61 has that end adjacent to the cam-bent into a cam strap which encircles the cam as shown, and when theshaft 32 is rotated theelbow lever 41`42 will be rocked, to advance the saw and to raise and lower the shaft Iii-15% Mechanism is provided forlifting the shaft 15--151out of engaging position when desired. The said mechanism comprises a lever 63 which is pivoted at '64 to the bracket 55, and this lever has'a cam portion or foot 65 which will engage the bearing 54 to lift the same when the lever is swung in the proper direction. Y

Referring to Fig. 5, it will Vbe seen that the roller 50 is mounted on a journal pin'66 which has a bearing G7 mounted toslide on the rod 44, and the rbearing is held in adjusted position by a set screw 68. By rreleasing theset screw the rollermay be adjusted toward and from the cam plate 51, to cause the pawl platej48 to belifted at the proper time. l.

In operation, the device is engaged with the saws as shown in Figs. 1 and 2, the arms of the stop yoke 7 engaging the spacing collars between the saws at one side of the saw to be ground, the clamp lO-ll engagingvat the other side of the saw. When the parts are properly adjusted, the adjustment of the pawl plate of course depending upon the size of the saw teeth, a rotation of the shaft 32 will rock the elbow lever ,l1- 42, to grind between the teeth of the saw, and to-advance the saw a distance of one tooth between each grinding operation, the engagement of the grinding wheel and the `pawl plate with the teeth being in alternation. As the teeth are l ground, they will come to the files 35, which will smooth down the saw at the throats of the, teeth. When a .saw has been ground the device may be moved to the next saw. It will be noticed that the base plate 4 for the standard A3 has a block 69 secured. to the under face thereof, which has its ,under face inclined to hold the standard atthe proper inclination. The stroke of the pawl plate may be nicely adjusted, so that it will never move the saw a distance greater or less than one tooth, by means of the roller 50. By arranging this lroller at the proper point it will lift the pawl plate out of engagement with the teeth and lower it into engagement with the'teeth at exactly the right points to move the saw; the proper distance. The yielding mounting of the sections of the grinding shaft with respect to each other permits some longitudinal movement of the grinding wheel to compensate for irregular teeth in the saws. Y

It should be noted that just before the feed pawl reaches the saw tooth throat on the `return stroke, the roller 50 clears the cam plate or finger 51, and should there be a gap or low place in thegin saw the feed pawl will reach into the low place or gap and rotate the saw cylinder. The spring 49 causes the feed pawl to positively engage the saw tooth throat one tooth at a time.' It is very necessary that the feed pawl blade or plate should be of thin steel, in order that it will not wedge or jam in the saw tooth throat and cause the gin saw tooth to be bent or wedged out of its proper or original shape. Because of the thinness of the feed pawl it is backed by the forked plate 46. It will be noticed that the eccentric 62 has more throw or travel than is necessary to engage a tooth at a time, and that as the feed pawl reaches the throat of the tooth, to bring the next tooth t o position to be operated upon, ythe eccentric at that point is just past the center, 'and hence the ltravel of the feed pawl is slowed, avoiding a too sudden movement of the saw cylinder. The moving of the cylinder is a quick and steady movement and there is always a positive stop during the operation of the files and grinding wheel. The feed pawl operating, as it does, atthe top of the saw, the entire machine is pressed snugly against the spacing blocks or collarsof the cylinder, being al-V ways held thus in .close contact with the cylinder.

4I claim:

- 1. A device of the character specified comprising a suitable lsupporting frame having means for engaging the spacing collars between the saws of a gin, a shaft journaled transversely of the frame, a shaft j ournaled longitudinall of the frame and extending perpendicu ar to the axis of the saw when the frame is in place, a gumming wheel at the end of the shaft adjacent .to the saws for gumming the same, means for advancing the saws tooth by tooth to the action of the gumming wheel, files for dressing the opposite faces of the saw as thev teeth are gummed, means controlled by the rotation of the first named shaft for reciprocating the files and for rotating the gumming wheel, means controlled by the rotation of the said shaft for alternately lifting that end of the shaft provided with .the gumming wheel and for advancing the saw, said means for adi vancing the saw comprising a reciprocating pawl having a stroke of a length to advance the saw a greater distance than a single tooth, andv means for preventing engagement of the pawl withthe teeth beyond predetermined points in its reciprocating movement, said means being'adjustable for-saws with various size teeth.

2. A device of the character specified comf prising as'uitable supporting frame having means for. engaging the spacing collars between the sawsof a gin, a shaft journaled transversely of the frame, a shaft journaled longitudinally of the frame and extending perpendicular tothe axis of the saw when theframe is in place, a gumming wheel at the end of the shaft adjacent to the saws for gumming the same, means for advancing the saws tooth by tooth to the action of the gumming wheel, files for dressing the opposite faces of the saw as the teeth are gummed, means controlled by the rotation of the rst named shaft for reciprocating the files and for rotating the gumming wheel, means controlled by the rotation of the said shaft for alternately lifting that end of the shaft provided with the gumming wheel and for advancing the saw, said means for advancing the saw comprising a reciprocating pawl having a stroke of a length to advance the saw a greater distance than a single tooth, and means for preventing engagement Les Yao

of the pawl with the teeth beyond predetermined points in its vrecip'roc'ating movement.

3. A device of the character lspecifiedfcornprising a suitable support, a shaft journal'ed longitudinally of the support'and having'a gumming wheel for enga-ging Ithe saws, means for rotating fthe Shaft, means controlled Vby the rotating =means ffor "lifting that end of the vshaft adjacent vtothe fgu'mf ming wheel `at-predeternlined intervalsfsaid gumming shaft consisting of vsections movable longitudinally With respect to Veach other and normally spring held in I'predetermined 'relation With respect to 'each other.

4. In a device of the character Specified, a stipporting frame, a gnmming shaft mounted to rotate thereon vand provided with a guniming WheeLYmeaHs atthe opposite end of the shaft "from the i-giiinming Wheel fo'rrotating the same, apaWl :forengaging the teeth of the saw vtoadvanceth'e teeth in succession Yto the gumming Wheel, means controlled'by the rotatingfmeans 4-for the gumming shaft 'for'operating-tlie paiv'l and vrfor lifting the gumming Wheelinalternation, Vsaid paWl comprising a relatively thin 4plate for engaging the-teeth, -a '-reinforcing plate for the yrst named plate, -said engaging plate being'movable Alaterally 'With respect tothe reinforcingfplateto)bringdifferent portions oftheedge of Vthe engaging plate into yengaging position, said reinforcing plate being 'forkedfat the end adjacent to the saw' and the arms of the fork engaging'ropposite faces ofthe saw.

5 A paWl for ladvancing 'saws to loe gummed, said payvl comprising a --`foot, Aa relatively thin engagingplate for the teeth, a l' reinforcing plate Vfor 'the thin plate, Said thin plate 'being arranged vbetween ythe freinforcing plate and the foot,-an`d being adjustable laterally with respect to -the rein- 'forcing `plate vand the 'fo'ot for the purpose specified, said reinforcing "plate :being forked at the end adj acentthe'siaw vandithe arms ofthe tfork adapted toengage vopposite faces of the saw.

6. -A 'p'aWl Afor ladvancing saws to -be gummed, said paWl comprising a lfoo't, fa

guinin'ed, said 'relatively thin v"engaging plate :fori the teeth,

relatively --thinl engaging plate for vthe teeth,

-relatively Dtliin engaging plate Vfor the iteeth,

and reinforcingplate for the thinplate, said Ethin plate being arranged "betweei'i the -reinfcreingfplateand vtheffoot.

8. A `pa-vilg'for advancing v#saws 'to be pawl comprising fa foot, a

:a reinfol'f'cingflplat'e for the thin plate, said thin' plate I being arranged between the reinforcingfplate Yand the foot, -'the reinforcing i plate Z-l'jeiiig forked at the v*end 'adj acent to the saw and the Varms adapted to f engage on oppositelsidesofthesaw.

'9. In 'a device of fthe-eharacterspecied,

"a "suitable isiipport, a i gumming shaft journaledon thesupport, Lin'eansfat one end of the shaft for lrot'atingth'e Same,l agurnming Wheel at "the other end,ine`ans controlled by the rotating `'im'"faill's'' f lthe Shaft I lifting the lgmming lwhe'el at "predetermined intervfals, a'spriiig'iibrfnally pressing'the'guinand -m'a'nu'ally VVcontrolled means for vholding the Wheel out vof'engagem(*3nt, AWith vthcit'eth.

l0. V(In aideviceof the character specified, a suitable support, giimming means 'for 'the 'Sa-W, fa 'paivl for advancingtheteeth in fsuccession vnto 'th'e `gumming ineans, means for moving tl-ie fpawl afgreater i distance Vthan is vnecessary"toadvan'ce the sia'vvthe distance of holdingthepawl out Y atoothyandneaiisfor of 'engagement `l`With Jth'e teeth ateither Vvend of f its "in'oveiiienn Leieept diiring a predetermined extent of its travel, andadjustableto -v'arythetimedurinfg in engagement yWith ilthe '-tth.

JHN `JACKSON WVitifesses:

-T. A. Shortly, CHA-lines Fni'zeAs'o. 

